13781043 has 32 divisors (see below), whose sum is σ = 21369600. Its totient is φ = 8769600.

The previous prime is 13781041. The next prime is 13781051. The reversal of 13781043 is 34018731.

It is not a de Polignac number, because 13781043 - 2¹ = 13781041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 13780998 and 13781016.

It is not an unprimeable number, because it can be changed into a prime (13781041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65208 + ... + 65418.

It is an arithmetic number, because the mean of its divisors is an integer number (667800).

Almost surely, 2^13781043 is an apocalyptic number.

13781043 is a deficient number, since it is larger than the sum of its proper divisors (7588557).

13781043 is a wasteful number, since it uses less digits than its factorization.

13781043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 13781043 is about 3712.2827209145. The cubic root of 13781043 is about 239.7511483093.

Adding to 13781043 its reverse (34018731), we get a palindrome (47799774).

The spelling of 13781043 in words is "thirteen million, seven hundred eighty-one thousand, forty-three".